1. Hieke, A. (2008), “Predicting Charged Particle Trajectories,” CEO, GEMIO Technologies, Inc., California, USA, ANSYS Advantage. Volume II, Issue 2.
2. “HANDBOOK of Charged Particle Optics,” second edition by Taylor and Francis Group;Orloff,2009
3. P.W. Hawkes “Advances in IMAGING and ELECTRONS PHYSICS,” Vol. 123 2002 London Academic press.
4. “A new Analytical Mathematical Model for Approximating the Magnetics Field of Symmetrical Lenses”, J. Col. Edu;Al-Obaidi;Al-Mustansiriyah University,1999
5. “Electrons Optics and Electrons Beam-Devices,” (Mir;Zhigarev,1975